An epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet's surface, to a subterranean lava-flooded mining facility.

Add mod Popular Mods  (0 - 30 of 43)
2115
Lambda Wars

Lambda Wars

135 Real Time Strategy

Lambda Wars (formerly Half-Life 2: Wars) brings the struggle between the human resistance and their Combine overlords to a multiplayer real-time strategy...

4233
Serious Swarm Marines

Serious Swarm Marines

3032 Third Person Shooter

There new mod for Alien Swarm, with new models and other changes.

4261
Hypovolemia

Hypovolemia

3790 Third Person Shooter

HYP is real time tactical shooter with chess like awareness and high skill ceiling. The game focuses on intricate game design while offering a unique...

4416
Omnibus

Omnibus

528 Arcade

Warhammer 40k mod for Alien Swarm. You play as one of four members in a Space Marine squad and you're sent to a Tyranid infected planet to investigate

5423
Black Mesa Swarm

Black Mesa Swarm

950 First Person Shooter

Black Mesa Swarm is an Alien Swarm total conversion remaking Valve Software's award-winning PC game, Half-Life.

5482
Modular Combat 2

Modular Combat 2

4300 First Person Shooter

Modular Combat 2 is an upcoming role-playing shooter based in the Half-Life universe. The game will feature upgraded graphics with custom shaders, AI...

5706
ALIEN SWARM FP

ALIEN SWARM FP

1660 First Person Shooter

This is a first person view modification of "Alien Swarm"

5770
Alien Swarm:SP

Alien Swarm:SP

2621 Third Person Shooter

Play the official Alien Swarm maps and any addons through the Offline Practice mode. Alien Swarm:SP also supports a large amount of configurable changes...

5911
Alien Swarm Aliens Mod

Alien Swarm Aliens Mod

2665 Tactical Shooter

this "mod" will replace weapon's data and sounds for alien swarm making it feel like Aliens. Furthermore, maps will be made for this mod and the final...

6069
The Survival

The Survival

1173 First Person Shooter

The Survival is an episodic Source Engine total conversion mod with an original storyline and unique cast of characters. Play your way through a post-apocalyptic...

6294
Reality Arms MOD

Reality Arms MOD

218 Third Person Shooter

A material and icon MOD which replaces the original resource.

6537
Alien Swarm: Reactive Drop

Alien Swarm: Reactive Drop

3501 Arcade

Adds new PvP game modes, co-op features and singleplayer support into Alien Swarm without changing its concept.

6566
Vectronic

Vectronic

173 Puzzle

Vectronic is a first-person environmental puzzle mod using Valve's Source Engine. Players must solve puzzles using special power balls that effect boxes...

6721
Alien Swarm: The Darkness

Alien Swarm: The Darkness

4062 Tactical Shooter

The Darkness is a mod designed to put the players into a much more difficult position than that of the original Alien Swarm, by removing a lot of lighting...

6941
Swarm Director 2

Swarm Director 2

1842 Third Person Shooter

Alien Swarm with a twist. Better AI, new mutations, new mapper tools.

7026
Optic

Optic

357 First Person Shooter

Optic is a team-based multiplayer shooter where players can take the role of either a fast-moving runner or a slow-moving hunter.

7211
Chaos Swarm Marines

Chaos Swarm Marines

1879 Third Person Shooter

There new mod for Alien Swarm, so on release we have new models and custom particles. More new portraits and other changes.

7464
Lights

Lights

3939 Cinematic

Once you find the light, nothing can defeat you...

7605
Space Swarm Marines

Space Swarm Marines

2104 Third Person Shooter

New mod Space Marines for Alien Swarm. :)

7683
Uprise

Uprise

775 First Person Shooter

The Resistance have mobilized agaisnt the Combine, causing the streets of City 17 to be turned into a warzone. Fight for the Resistance as a Rebel or...

7791
Marine retexture

Marine retexture

1052 Third Person Shooter

this addon makes the marines look more dirty & the sarge has a camo now,

7795
Enhanced Interstella Armed Forces

Enhanced Interstella Armed Forces

1098 Third Person Shooter

A new MOD based on Alien Swarm 2011 version. It is an independent game that does not need a installed Alien Swarm. Many data about marines and equipments...

7894
Tron Swarm

Tron Swarm

2279 Third Person Shooter

New custom models from Tron Revolution for Alien Swarm.

8012
Apocalypse-22

Apocalypse-22

6246 First Person Shooter

Apocalypse cuenta la historia de Abigaíl, una mujer de 28 años de edad en un futuro apocalíptico y sin memorias de su pasado. (Historia en desarrollo)

8275
Alien Swarm Director Mod

Alien Swarm Director Mod

2753 Third Person Shooter

Welcome to the Alien Swarm Director Mod! ASDM is a single player Alien Swarm mod focusing on increasing replayability by creating a dynamic experience...

8328
Swarm Keeper

Swarm Keeper

1677 Real Time Strategy

Swarm Keeper is a Dungeon Keeper inspired modification for Alien Swarm. It offers the following features: Build a dungeon for your creatures (aliens...

8338
ALIENS

ALIENS

1369 Tactical Shooter

A mod for Alien Swarm that is based on the ALIENS movie but for a set of new marines to go and investigate LV426 and see what happened there! (This is...

8427
Alien Swarm SDK Template Conversion

Alien Swarm SDK Template Conversion

2718 First Person Shooter

C_b_fofep and I decided to convert the Alien Swarm build back into an FPS source engine version. This takes the orange box or the SDK template code and...

8434
Zombie Swarm.

Zombie Swarm.

2919 Third Person Shooter

Greetings, members of ModDB. My name is Kenny, and I am currently the sole team member of the Zombie Swarm team. I originally started this project in...

8935
Alien Swarm: Rifle Mod

Alien Swarm: Rifle Mod

2270 Arcade

Rifle Mod is an Alien Swarm server-only mod that forces players to play with assault rifles only, harder aliens, more ammo, smarter bots. However rifle...